diff --git a/docs/arraybuffer.md b/docs/arraybuffer.md
index 236f780..85daa28 100644
--- a/docs/arraybuffer.md
+++ b/docs/arraybuffer.md
@@ -452,17 +452,7 @@ Float64Array.BYTES_PER_ELEMENT // 8
 ```javascript
 // ArrayBuffer转为字符串，参数为ArrayBuffer对象
 function ab2str(buf) {
-  if (buf && buf.byteLength < 128000) {	// limit max length avoid overhead
-    return String.fromCharCode.apply(null, new Uint16Array(buf));
-  }
-
-  const bufView = new Uint16Array(buf);
-  const len =  bufView.length;
-  const bstr = new Array(len);
-  for (let i = 0; i < len; i++) {
-    bstr[i] = String.fromCharCode.call(null, bufView[i]);
-  }
-  return bstr.join('');
+  return String.fromCharCode.apply(null, new Uint16Array(buf));
 }
 
 // 字符串转为ArrayBuffer对象，参数为字符串